Which upgrade (A64 +mobo or X800)

I've decided to upgrade this machine, as it is becoming a bit dated.
The only problem is I don't know what to upgrade.

I am on a limited budget, and thus can not afford to upgrade both cpu& mobo along with the video card.

First the three alternatives I'm looking at:

A64 3000+ and msi K8 Neo Platinum (Socket 754)

A64 3500+ and MSI K8T Neo2 Fir (Socket 939)

An X800 based card
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1 is what I'd call a stop-gap upgrade as it won't be a very big upgrade (from my 2500+), nor one which I'd expect to last very long. It'll neither have Socket 939 nor PEG which would be nice to have. But it is cheap and I could get it faster.
2 is a bit more future-proof with Socket 939 and a better cpu. It won't have PEG, but as I can not afford both this and a new video card, I can live with that (besides, mobo's are cheap compared to cpu's)
3 will accomplish what I'd really like, as I'll be able to turn AA back on in BF1942 (running AA at 1280*1024 is not working in that game).

2 and 3 is around the same price and are the ones which are the most tempting. 1 is cheaper and thus won't affect my budget too much.

And a few Q's
As I'm using Win2k, will I see any effect of going 64-bit?
I know there is a 64-bit version of XP coming, but I'd prefer to stick to Win2k. Will (and how will) it work?

Also, do you agree with my choices for motherboard in 1 and 2, or do you have other suggestions?

I am mostly drawn to 1 for now, and then picking up an X800 based card when it drops some more in price.

I too vote for a Socket-754 / 3000+ upgrade for now. Once VGA cards start leaving AGP, it'll make thos cards even cheaper.

Since you seem to change mobos everytime you upgrade your CPU anyways, I don't think it's such a big deal for you to go socket-754 now & eventually get a socket-939 system further down the road.

& even if you don't, you can always get a 3700+ for your socket-754 board. The only downside I see is that 0.09 Athlon64s aren't scheduled to be released for the socket-754 platform. But in any case, they already run quite cool as it is.